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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 790 · 40 questions
TalentJR

The trick (Choose a trick): × 9 → finger trick; × 4 → double double; × 10, 100, 1000 → slide and add zeros. 37, 12345679 or 111… → magic patterns; reverse and subtract → 1089. Puzzles: find the rule, the total or the leftover days, then check your answer.

NameDateTime takenScore ___ / 40
  1. 1.Double 25 =
  2. 2.9 × 6 = ?4 — what is the missing digit?
  3. 3.1 + 2 + 3 + … + 51 =
  4. 4.9 × 4 = ?6 — what is the missing digit?
  5. 5.You have 15 coins. Each coin is ₹1 or ₹2, and together they make ₹22. How many ₹2 coins do you have?
  6. 6.41 × 4 =
  7. 7.If today is Friday, what day was it 27 days ago? (a) Tuesday (b) Sunday (c) Friday (d) Saturday
  8. 8.What comes next? 16, 25, 36, 49, ? (a) 66 (b) 62 (c) 64 (d) 65
  9. 9.Magic square (every row, column and diagonal has the same total): 33 12 27 | 18 24 ? | 21 36 15. What is the missing number?
  10. 10.Do the 1089 trick with 256: reverse and subtract, then reverse that answer and add. What do you get?
  11. 11.What comes next? 3, 6, 12, 24, ? (a) 49 (b) 36 (c) 42 (d) 48
  12. 12.12345678 × 9 + 9 =
  13. 13.Magic trick! Think of 4. Double it, add 10, halve it, then take away 4. What number do you get?
  14. 14.9 × 3 = 2? — what is the missing digit?
  15. 15.1 + 2 + 3 + … + 74 =
  16. 16.1 + 2 + 3 + … + 10 =
  17. 17.Magic square (every row, column and diagonal has the same total): 9 8 13 | 14 ? 6 | 7 12 11. What is the missing number?
  18. 18.Take 563. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  19. 19.11 × 11 =
  20. 20.Magic square (every row, column and diagonal has the same total): 7 ? 19 | 28 16 4 | 13 10 25. What is the missing number?
  21. 21.2 × 9 =
  22. 22.1 + 2 + 3 + … + 61 =
  23. 23.87 × ? = 8700
  24. 24.Think of 2. Multiply it by 2, then add 9. What number do you end with?
  25. 25.The 3rd of a month is a Sunday. What day is the 30th of the same month? (a) Tuesday (b) Friday (c) Saturday (d) Sunday
  26. 26.6 × 9 =
  27. 27.22 × 4 =
  28. 28.A piggy bank has 10 coins of ₹5 and 14 coins of ₹2. How many rupees are in it?
  29. 29.If today is Monday, what day will it be after 70 days? (a) Sunday (b) Monday (c) Thursday (d) Tuesday
  30. 30.10 × 4 =
  31. 31.4 × 9 =
  32. 32.69 × ? = 6900
  33. 33.17 × 4 =
  34. 34.98 × 100 =
  35. 35.Take 37 and take away the sum of its digits. What do you get?
  36. 36.Do the 1089 trick with 543: reverse and subtract, then reverse that answer and add. What do you get?
  37. 37.Half of 58 =
  38. 38.In 2 years a boy will be 10 years old. How old was he 4 years ago?
  39. 39.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 81 (c) 80 (d) 70
  40. 40.Take 18 and take away the sum of its digits. What do you get?

Answer key

  1. 50
  2. 5
  3. 1326
  4. 3
  5. 7
  6. 164
  7. Saturday
  8. 64
  9. 30
  10. 1089
  11. 48
  12. 111111111
  13. 5
  14. 7
  15. 2775
  16. 55
  17. 10
  18. 198
  19. 121
  20. 22
  21. 18
  22. 1891
  23. 100
  24. 13
  25. Saturday
  26. 54
  27. 88
  28. 78
  29. Monday
  30. 40
  31. 36
  32. 100
  33. 68
  34. 9800
  35. 27
  36. 1089
  37. 29
  38. 4
  39. 80
  40. 9

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